Downgrade from squeeze to lenny..

If you were distracted in the last 3 days and forgot that Debian 'stable' became 'squeeze' last Sunday, or just inadvertently issude 'apt-get upgrade' on your lenny machine, wondering why you had more than 200 packages to update, but still pressing Yes Yes Yes... well you have done the thing I did at least  on one of my servers...

But no problem, downgrading is easy in apt.

Just put:

Package: *
Pin: release a=oldstable
Pin-Priority: 1001

in /etc/apt/preferences and do again

apt-get update && apt-get upgrade

I was so lucky to have to force jsut one package

dpkg -i --force-overwrite /var/cache/apt/archives/sysvinit_2.86.ds1-61_i386.deb

 And reinstall one of them because apticron was failing the downgrade

apt-get install mktemp --reinstall && apt-get install apticron

Cheers